package thread;

import java.util.*;

/**
 * 并发安全的集合API
 * ArrayList,LinkedList,HashSet都不是并发安全的
 */
public class SyncDemo5 {
    public static void main(String[] args) {
//        List<Integer> c = new ArrayList<>();
//        List<Integer> c = new LinkedList<>();

//        List<Integer> c = Collections.synchronizedList(new ArrayList<>());

//        Set<Integer> c = new HashSet<>();
        Set<Integer> c = Collections.synchronizedSet(new HashSet<>());

        Thread t1 = new Thread(){
            public void run(){
                for (int i = 0; i < 1000; i++) {
                    c.add(i);
                }
            }
        };
        Thread t2 = new Thread(){
            public void run(){
                for (int i = 1000; i < 2000; i++) {
                    c.add(i);
                }
            }
        };
        t1.start();
        t2.start();

        try {
            Thread.sleep(50);
        } catch (InterruptedException e) {
        }

        System.out.println(c.size());//2000?

    }
}
